Improved emery-wheels foe grinding and polishing saws



@eine geen; @eine @new GEORGE L. BENTON, OF ROCHESTER, NEW YORK, ASSIGNOR TO HIMSELF V `AND JOHN GREENWOOR OF SAME PLAGE.

Leiters. Patent No. 70,393, dated November 5, 1867 die Stimuli einer it iii ilgen Enters tant mit melting ritt mi tige smut.

'lO ALL WHOM IT MAY CONGERN:

Be it lino-wn that I, GEORGE L. BENTON, of Rochester, in the cou'ntyoi` Monroe, and State of New York, havcinvcnted a certain new and useful improvement in Emery-Wheels for Grinding Saws, die.; and I do hereby declare that the following is a full and cxactdescription thereof, reference being had to the accompanying drawings, making part effi/this specication.

Figure 1 is a perspective view of my `improved @mary-Wheel mounted in a frame.

Figure 2, a section ofthe wheel detached, and a View of a saw which is being ground.

Figure 3, a modification of the form of the wheel.

Like letters of reference indicate corresponding parts 4in all'thc iigures.

In grinding saws with an ordinary wheel, a groove or channel is worn into the face of thc wheel, equal in extent to the'length of thc teeth. This not only spoils the wheel', but the groove being worn down to the gauge of one set of saw-teeth of a given size, it is not adapted to receive teeth of largersize.

It is the object of my improvement to remedy this diiiculty, and the `invention consists in providing the face of the wheel with a plane rim of such width as te receive the grinding surface, and depressing or hollowing the remainder or the central portion of said face, so that the rim will wear back square and uniform.

As represcntedin the drawings, A is the emery-wheel, and B a frame on which itis mounted. vI` foi-1n the front or face of tliewheel with a narrow, square rim, a, of a width suitable 'to receive the teeth of the saw,

which, when applieiLTeach clear across. The central portion of. the face of the wheel s depressed or made.

hollowing,`as shown at I), ,so as not to come in contactwith the article beingground. The back ofthe wheel is made conical or convex, as shown at c, corresponding with the cavity in the face of the wheel, so that as the rim a is worn down, it will still present the same width of grinding surface.

By this arrangement the edges of the saw-teeth reach clear across the grinding rim a, and the latter wears down equallyat alli times; and owing to the peculiar form of thc wheel, the wear always leaves the same grinding face. I ain thus enabledto grind saws without producing a groove in the emery-wheel, asis produced by the use of any other wheclwithin my knowledge. It will be noticed that the angle or bevel of the outer edge of the wheel is best adaptedsto-fit the angle between the teeth ofthe saw 'in grinding.

What I claim as my invention, anddesire to secure by Letters Patent, s

The emery-wheel formed with the narrow grinding rim a, and central depression Zi, and made of the conical or convex shape herein described, the same operating in the manner and for the purpose specified- In'witncss whereof Ihavc hereunto signed my'naine in the presence of two subscribing witnesses.

GEO. L. BENTON.

Witnesses:

R. F. Oscoon, J. A. DAVIS. 

